Abstract

We report on measurements of the polarization of extragalactic sources at.148 GHz made during the first two seasons of the Atacama Cosmology Telescope Polarization (ACTPol) survey. The survey covered 680 deg(2) of the sky on the celestial equator. Polarization measurements of 169 intensity-selected sources brighter than 30 mJy, that are predominantly active galactic nuclei, are presented. Above a total flux of 215 mJy where the noise bias removal in the polarization measurement is reliable, we detect 2.6 sources, 14 of which have a detection of linear polarization at greater than 3 sigma-significance. The distribution of the fractional polarization as a function of total source intensity is analysed. Our result is consistent with the scenario that the fractional polarization of our measured radio source population is independent of total intensity down to the limits of our measurements and well described by a Gaussian distribution with a mean fractional polarization p(m) = 0.02.8 +/- 0.005 and standard deviation sigma(pm) = 0.054, truncated at p = 0. Extrapolating this model for the distribution of source polarization below the ACTPol detection threshold, we predict: that one could get a clean measure of the E mode polarization power spectrum. of the microwave background out to l approximate to 6000 with 1 HK-arcminute maps over 10% of the sky from a future stu-vey. We also study the spectral energy distribution of the total and polarized source flux densities by cross-matching with low.radio frequency catalogues. We do not find any correlation between the spectral indices for total flux and polarized flux.